398076649 has 4 divisors (see below), whose sum is σ = 411803460. Its totient is φ = 384349840.

The previous prime is 398076629. The next prime is 398076697. The reversal of 398076649 is 946670893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 946670893 = 7 ⋅135238699.

It can be written as a sum of positive squares in 2 ways, for example, as 241025625 + 157051024 = 15525^2 + 12532^2 .

It is a cyclic number.

It is not a de Polignac number, because 398076649 - 2⁹ = 398076137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 398076596 and 398076605.

It is not an unprimeable number, because it can be changed into a prime (398076629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6863362 + ... + 6863419.

It is an arithmetic number, because the mean of its divisors is an integer number (102950865).

Almost surely, 2^398076649 is an apocalyptic number.

It is an amenable number.

398076649 is a deficient number, since it is larger than the sum of its proper divisors (13726811).

398076649 is a wasteful number, since it uses less digits than its factorization.

398076649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13726810.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The square root of 398076649 is about 19951.8582843804. The cubic root of 398076649 is about 735.6234542304.

The spelling of 398076649 in words is "three hundred ninety-eight million, seventy-six thousand, six hundred forty-nine".